Malicious PDF — malware analysis report

Static analysis result for SHA-256 71ebd9aed43d5de0…

MALICIOUS

PDF

83.9 KB Created: 2021-07-06 14:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94603387bf62d4de3be651485cee886a SHA-1: a608121f04540dc8c82fc9bdd1bb7e2ac7fc22f6 SHA-256: 71ebd9aed43d5de02e64869432461a8d24086b76756e14563aa5532193855436
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The file contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/85102a625abf8647cdfb4062530128ba/wapijapozipi.pdf
    • http://brlairport.com/images/file/konupewogoxa.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16083db4ac183b---fowuvukawemamikotudag.pdf
    • http://furniture83.com/upload/files/pitixufav.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609859b24d153---pejadupedizofibofewozak.pdf
    • http://j-club.eu/userfiles/file/xawejoriwadegivegutuw.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5c74f517dd7954f519628b570e0c84ee/wuvexopelelulakukel.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cb965723dcd72b2048087be3812cbdbb/fovebejixepuma.pdf
    • http://ateliergermain.net/sites/default/files/file/47154657785.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/7118143762.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/f24177931d34fb87fcc9fd6735309919/38025661031.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c6e680de6---xipumilokuzufi.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094319038095---rozomakibato.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/vgfglet2dkc2p49m52pqic2br1/50897454434.pdf
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/47233744529.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a7e056fa6---fugejaverera.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f0db36140---90229263396.pdf
    • http://lucann.com/Upload/file/7096182281.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28477172dc---palotizonopudoxojojobufu.pdf
    • http://adabaskimerkezi.com/upload/file/kirozenemesikurafi.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ff12330f77bc661c8787057a44bc4e82/14361566661.pdf
    • http://pnmanagementsolutions.in/uploads/95940973364.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c334ca04d10.pdf
    • http://hevolta.com/upload/file/67020393983.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b24fbec9eb142b076e0e116925ed5ae/wibuwunajuredesak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=to+bear+the+cost
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8fd.bin
2db838642f9a2cea2898b4eaec680a9a6b89be49c5e94a6d123780febcde3f91
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FD 16340 bytes
font_01_sfnt_off00011351.bin
1654dd5d4424a90779896d9d8148975db67bb82efb6e15ab4dac3f74864d51da
pdf-font-stream PDF embedded font (sfnt) at offset 0x11351 10188 bytes
font_02_sfnt_off00012a53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 16792 bytes